You need to use proc SGPANEL.
This works exactly like proc SGPLOT, except you can provide a PANELBY statement providing a (list of) classification variables. In your case that will be PANELBY date. You can control the paneling by providing the correct options on the PANELBY statement.
Many layouts are available, the default is PANEL, which is what you probably want for one class variable. If you have multiple class variables, say month for column and Year for Row, then you can also use LAYOUT=LATTICE.
Plot statement options are very similar to SGPLOT. Please see the doc for proc SGPANEL under SAS/GRAPH Statistical Graphics Procedures.